Reads
• Full range pH reading from .001 to 14.000
• Accurate pH readings down to the thousandths place (+/- 0.02)
• Temperature dependent or temperature independent readings
• Flexible calibration protocol supports single point, 2 point, 
or 3 point calibration
• Calibration required only once per year with
Atlas Scientific pH probe
• Single reading or continuous reading modes
• Data format is ASCII

Two data protocols
• UART asynchronous serial connectivity
• (RX/TX voltage swing 0-VCC)
• I2C (default I2C address 0x63)
• Compatible with any microprocessor that supports UART, 
or I2C protocol
• Operating voltage: 3.3V to 5V
• Works with any off-the-shelf pH probe

Sleep mode power consumption
• 0.995mA at 3.3V

Circuit Specs
• Dimensions: 13.97mm X 20.16mm (0.55" X0.79")
• Weight: 1.76 grams

EZO™ pH Circuit Datasheet
Wiring Diagram
Arduino Uno Sample Code
Arduino Mega Sample Code
Arduino I²C Sample Code

Raspberry Pi Sample Code
Raspberry Pi I²C Sample Code
pH CAD Footprint File (*.dxf)
RoHS Certificate
CE Certificate

Datasheet